I smoke on a daily basis when I got the $$, but I have some helpful information, compliments of "The Emperor Wears No Clothes" by the man Jack Herer.
Medicinal Benefits:1. Asthma: "Taking a hit of marijuana has been known to stop a full blown asthma attack." (personal communication with Dr. Donald Tashkin, December 12, 1989 and December 1, 1997)  Today, Californian asthma sufferers, with a doctor's recommendation, can legally grow and use cannabis medicines.
2. Glaucoma: Cannabis smoking would benefit 90% of the 2.5 million glaucoma victims, and is two to three times as effective as any current medicines for reducing ocular pressure. (Harvard; Hepler & Frank)
3. Tumors: Researchers at the Medical College of Virginia discovered that cannabis is an incredibly successful herb for reducing many types of tumors, both benign and malignant.  In 1975, a medical breakthrough occurred and successful tumor reductions were recorded.
4. Nausea Relief: "Marijuana is the best agent for control of nausea in cancer chemotherapy." (Dr. Thomas Ungerleider, head of California's Marijuana for Cancer Research Program from 1979 to 1984)  This is also true for AIDS treatment.
5. Epilepsy: "Marijuana...is probably the most potent anti-epileptic known to medicine today." (Medical World News, Mikuriya, Tod H., M.D.)
6. Antibiotic/Disinfectant: For virtually any disease or infection that can be treated with terramycin, cannabis derivatives did better in Czechoslovakian studies, 1952-1955.  Direct contact with THC killed herpes virus in a University of South Florida (Tampa) 1990 research study by Dr. Gerald Lanez.
7. Lung Cleaner and Expectorant: Cannabis is the best natural expectorant to clear the human lungs of dust, smog and the phlegm associated with tobacco use.  Marijuana smoke effectively dilates the airways of the lungs, the bronchi, opening them to allow more oxygen into the lungs.  It is also the best natural dilator of the tiny airways of the lungs, the bronchial tubes, making cannabis the best overall bronchial dilator for 80% of the population.  (UCLA Tashkin Studies, 1969-97; U.S. Costa Rican, 1980-82; Jamaican studies 1969-74, 76)
8. To Increase Appetite: Cannabis is, at this time, the very best medicine on the planet for anorexia.
I suggest you try to find and read this book.  It will change everything you thought you knew about trees, trust.